Extension paint spraying device



June 5, 1934. A. H. DowNs EXTENSION PAINT SPRAYING DEVICE Filed Oct. l5, 1930 5 Sheets-Sheet l uw um, N

June 5, 1934. A. H. DOWNS EXTENSION PAINT sPRAYING DEVICE Filed Oct. 15", 1930 3 Sheets-Sheet 2 ATTORNEY June 5, 1934. A. H. DowNs EXTENSION PAINT SPRAYING DEVICE 3 Sheets-Sheet 3 Filed Oct. l5

l VE TOR Patented June 5, 1934 UETED Parer- EXTENSION PAINT SPRAYING DEVICE Application October 15,

15 Claims.

r1`his invention relates to improvements in de vices for spraying paint, lacquer, and similar liquids which are commercially called paint guns, air brushes and so forth.

The standard devices of this kind at present in use are relatively short and can only be used for painting articles and surfaces close to the operator and readily accessible. It is quite advantageous to be able to spray paint at a distance from the operator and also to reach outn oi-way places and positions that are normally inaccessible. Consequently I have invented a construction which will enable the operator to paint or treat surfaces at a distance and also to reach places and positions that are normally inaccessible. The construction also includes an adjustable discharge nozzle arrangement whereby the atomized iiuid :may be discharged rearwardly instead of forwardly and as a matter of fact, to various angles to what might be termed the normal direction of the spray.

In order to accomplish these results I have invented a device which may be attached to standard forms of air brushes at present in use,

such as disclosed for example in my Patent No.

1,706,875. This attachment may take several forms, one being a straight device to apply the liquid at a distance from the operator holding the air brush; another having a rearwardly or backwardly directed nozzle on the end of a comparatively long narrow extension adapted to be inserted through narrow openings and to spray the rear portions or inaccessible parts of some article, and another providing an adjustable nozzle construction on the end of an extension which may be adjusted to direct the spray forward or backward or at various angles therebetween.

To the accomplishment of the foregoing and such other objects as may hereinafter appear, this invention consists in the construction, combination and arrangement of parts hereinafter described and then sought to be defined in the appended claims, reference being had to the accompanying drawings forming a part hereof and which show, merely for the purpose of illustrative disclosure, several embodiments of my invention, it being expressly understood, however, that various changes may be made in practice within the scope of the claims without digressing from my inventive idea.

In the drawings- Figure l represents a perspective view .of an air brush or paint gun at present in commercial use, of the cup-gun type, having a straight extension applied thereon.

1930, Serial No. 488,769

(Cl. Sil-) Figure 2 is a longitudinal cross section through the extension and discharge tip end of the gun shown in Figure 1, the parts being on an enlarged scale.

Figure 3 is a vertical transverse cross section on line 3-3 of Figure 2.

Figure fl is a vertical transverse cross section on line 4 4 of Figure 2.

Figure 5 is a side elevation of another form of extension in which the nozzle construction is directed rearwardly from the normal line of discharge of the material.

Figure 6 is a vertical longitudinal section through the construction shown in Figure 5 on an enlarged scale.

Figure 7 is a vertical transverse cross section taken on line 7 7 of Figure 6.

Figure 8 is a side elevation of another form of this attachment in which the nozzle construction may be adjusted to various angles with reference to the normal line of liquid discharge.

Figure 9 is a horizontal cross section through the construction shown in Figure 8, taken on an enlarged scale, the parts being shown in a straight condition. f

Figure 10 is a vertical transverse cross section on line 10-10 oi Figure 9.' Y

Figure 11 is a side elevation of another form of attachment in which the nozzle construction may be adjusted to various desired positions.

Figure 12 is a longitudinal horizontal sectional View with the sections of the attachment in alinement. Figure 13 is an enlarged top plan View of the head on one section of the attachment with parts broken away.

Figure 14 is an enlarged vertical sectional view taken through the interiitting heads on the sections substantially on line 14-14 of Figure 12.

Referring now to the drawings the numeral 1 designates an air brush or paint gun of a standard type to which is connected a fluid or paint container 2 in the form of a cup having the paint discharge connection 3 leading to the body of the gun. Air under pressure is supplied to the gun through the air inlet connection 4. The nozzle end of the gun is indicated generally by the reference character 5 and includes the boss 6 which is screw threaded into the end of the gun andl provided with the liquid conduit '7 communicating with the liquid discharge conduit 3 from the cup or container 2. The front end of the boss 6 is provided with the internally screw threaded socket or recess 8 to receive the iiud tip member 9 which has the restricted bore 10 therethrough, the inner end of which forms a seat for the plunger or valve 11 which is controlled by the trigger construction 12. This boss member 6 is also provided with a plurality of ports or passages 13 to permit the passage of air therethrough and around the iluid tip. When used without the extension a nozzle member 14 is mounted in position over the fluid tip and against the external shoulder 15 provided on the boss 6 and is held in position thereon by locking sleeve or collar 16. These parts are all of standard construction and the operation thereof is well known. When the trigger 12 is pulled, air is discharged through the nozzle and pressure applied to the fluid in the container. Further movement of the trigger moves the valve or plunger 11 from its seat and permits fluid to pass from the fluid tip into the nozzle where it is broken up and atomized by the air passing thereinto and therethrough by means of the ports or passages 13. When it is desired to use the extension attachment the nozzle 14 is removed and the gun is ready for the attachment.

In the form shown in Figures 1 to 4 inclusive, this attachment comprises an elongated pipe or conduit 17 having an enlarged rear end 18 provided with a shouldered flange 19 to nt on the boss 6 and against the shoulder 15 thereof. lt is held in position thereon by means of the sleeve or collar 16 in just the saine manner in which the nozzle 14 is held thereon. This enlarged rear end 18 provides an enlarged air receiving compartment 20 in communication with the air ports or passages 13 through the boss 6. The extension device is provided with an inner pipe or conduit 21 rWhich terminates in a ared or bevelled end part 22 adapted to i'lt over and engage the outer surface of the iiuid tip 9, this inner pipe or conduit 21, therefore, constituting a iiuid conduit. The outer pipe or conduitV constitutes an air conduit communication with the chamber 20 being provided by means of a plurality of openings 23.

At the front or discharge end of the extension 17 a nozzle construction is provided, which includes rst a iiuid tip 24 which is securely connected to the end of the inner pipe or conduit 21, a nozzle member 25' having a shouldered iiange 26 adapted to bear against the shoulder 27 formed on the outside of the outer pipe or conduit 17 and held thereagainst by means of the flanged sleeve or collar 28. The outer surface of the fluid tip 24 is grooved as at 29 to provide air ports or passages affording communication between the air conduit 17 and the air compartment 30 in the nozzle member 25. This nozzle and uid tip construction is similar to that shown in my Patent No. 1,706,875 and is of standard construction. The operation of this device varies in no Way from the operation of the standard air brush or paint gun. When the operator pulls the trigger, air under pressure will first be discharged through the nozzle 25 and then uid under pressure will be supplied through the iluid tip 9 and the iiuid conduit 21 and the second iiuid tip 24 to the interior of nozzle 25 where it will be broken up and atomized before being discharged, from the nozzle 25. This extension may be of various lengths depending upon the requirements and necessities of the work. It may also be of various sizes so as to be useful in small or large openings.

The construction shown in Figures 5, 6 and 7 is substantially the same as that just described with the exception that the nozzle end of the extension is constructed so as to direct the discharge of the liquid rearwardly. Parts at the nozzle end of the gun proper and the attachment 0f the extension thereto are all the same. The extension 31 itself is the same except that it is formed with the sharp bend or turn 32 whereby the nozzle construction 33 is directed at a sharp angle toward the rear. The nozzle construction of the extension is the same as that described in connection with Figures 1 to 4. Of course the fluid conduit 34 in the extension is bent as well as the air conduit 35 in the extension.

These parts may be of various lengths, various sizes and the discharge end may be bent at various angles. It is obvious that with this extension the discharge nozzle can be passed through narrow openings or closely tting parts and then be turned so as to direct the discharge liquid against the rear portions and otherwise inaccessible parts of the surface being treated.

The embodiment of my invention shown in Figures 3, 9 and 10 is likewise similar to the device previously described in so far as the attaching end 36 of the extension 37 is concerned, and also as far as the discharge nozzle construction 33 is concerned. The only difference resides in the provision for adjusting the angular position of the discharge nozzle with respect to the extension as a whole. In other words, in this construction the discharge nozzle may be adjusted to meet various operating conditions without the necessity of detaching the extension from the gun or brush.

In order to accomplish this function the pipe or conduit 39 is formed with a T head 40, the liquid conduit 41 communicating with one branch of the T and the air conduit 41 communicating with the other branch of the T. This T head terminates in the form of reduced bevel face portions or seats 42 which are adapted to receive correspondingly shaped parts 43 of arms 44. These arms are hollow to afford conduits for the air and fluid respectively and their parts 43 have a tight turning t upon the T head 40. The other end 45 of the extension is provided with the liquid conduit 46 and the air conduit 47 which communicate with the branches of the T head 48. Each end of each branch is provided with a bore or seat 49 to receive a complementarily shaped extension 50 onl the end of the connecting arm 44 and having a tight and rotatable lit therewith. The two arms 44 are connected by the turn buckle construction 51 whereby they may be loosened or clamped in position tightly againstI the seats. Of course, when the arms are loose the nozzle portion 45 of the extension may be adjusted to various angles with respect to the extension as a whole and the tightening of the turn buckle holds the parts in adjusted position. This construction provides a double pivot for the discharge nozzle portion 45 of the extension to permit a wide range of adjustment, and the -j hollow arms 44 afford communication between the air conduits and the liquid conduits respectively.

Again the parts of this extension may be of various sizes and various lengths so as to serve under various working conditions. This form of my invention provides the maximum range of service.v

The extension 52 shown in Figures 11 to 14 inclusive of the drawings is substantially the same as that shown in Figures 2 and 6 with the exception that the nozzle end of the extension is adjustable so as to direct the discharge of the liquid in any direction. Parts at the nozzle end of the gun proper and the attachment of the extension thereto are all the same. The extension includes the outer tube or conduit 53 for air and the inner tube or conduit 54 for fluid. The end of outer tube 53 has threaded engagement with the externally threaded hollow extension 55 on a head 56. The head 56 has a central bore 57 extending therethrough. The end of inner tube 54 ts in opening 58 in head 56 and thus communicates with the central bore 57. The end portion of the bore 57 is tapered as at 59 to form a bevelled seat to receive the tapered or bevelled head 60 of the bolt 61. The top surface of the head 56 is of convergent or frustoconical form and is provided with an annular groove 62 which is concentric with and extends around bore 57, and communicates with the interior of extension 55 by means of the port or passage 63 (see Figure 13).

A tubular section 64 is held in pivotal relation to the head 56 by means of the bolt 61. Section 64 is provided at one end with an annular head 65 which has its contacting surface in a concave form so as to t on the top convergent surface of head 56 and provide a tight pivotal joint therewith. The head 65 has a central bore 66 which is alined with bore 57 of head 56 to form a conduit therewith. The outer end of head 65 is bevelled as at 67 to receive the bevelled or tapered surface 68 on nut 69. The bolt 61 and nut 69 serve as connecting means for the two heads 56 and 65 and the bevelled surfaces of the heads and the bolt and nut cooperate to form a hermetically sealed joint. This construction permits pivotal adjusting movement between the heads when the nut is loosened so that the tubular section 64 and its nozzle may be adjusted to any desired position with respect to the gun and extension as a whole.

The contacting portion of head 65 is provided with an annular groove 70 which is concentric with the bore 65 and in alinement and communication with groove 62 in head 56 to form an air chamber or compartment therewith. This groove 70 communicates with the outer tubular extension 71, as shown in Figure 12. The tubular extension 71 surrounds an inner smaller tube 72 which ts into the opening 73 in the head 65 and communicates with the central bore 66 therein. The outer end of the tubular section 64 is provided with a fluid tip and nozzle member which is similar to the construction shown in the foregoing figures. It will be apparent that the inner tubes 54 and 72 connected by the passages 57 and 66 in the heads form the liquid conduit and outer tube 53 and tubular extension 71 together with the annular depressions 62 and 70 form the air conduit.

From the foregoing description it will be seen that the two sections of the extension are pivctally connected by a hermetically sealed joint and that the tubular section 64 and its attached discharge nozzle may be adjusted to any position desired by the operator so as to direct the discharge of the fluid in any direction.

By using my invention it is possible to provide an extension on a paint gun or the like, the flow of iluid through the extension being controlled by the valves and operating mechanism therefor on the gun itself and no other linkages or levers are required between the extension and the gun. Y

What I claim is:

l. An extension attachment for paint guns or the like having means for connection with the discharge end of a gun, said attachment having liquid and air conduits, a discharge nozzle construction, and means for pivotally connectingV said nozzle construction to said attachment so that it may be moved with respect to the gun.

2. In combination with a fluid tip of a paint gun, a tubular extension provided with air and liquid conduits, said tubular extension being formed of two sections pivoted together near one end of said extension, a fluid tip for said liquid conduit and a nozzle member enclosing said fluid tip and communicating with said air conduit.

3. An attachment for paint guns or the like provided with a section having a plurality of concentric tubular members, another section having a plurality of concentric tubular members and means for pivotally connecting said sections together so that the concentric tubular members form a plurality of separate conduits, and a nozzle construction on the end of said second section.

4. An extension for paint guns or the like adapted for connection with the discharge end of a gun, a fluid conduit and an air conduit for said extension, a nuid tip on said fluid conduit and a nozzle member for said air conduit, a portion of said extension being movable with respect to the remainder of said extension and being adapted to assume a position at an angle to the remainder of said extension so that the spray may be directed to normally inaccessible places.

5. An extension for paint guns comprising a plurality of connected conduitsadapted to `communicate with the air and fluid conduits of the gun, a fluid tip for one conduit and a nozzle member for another conduit, said tip and nozzle member cooperating to give a spray, said extension being formed of a plurality of sections which are pivctally connected to provide a means for directing a paint spray to normally inaccessible places.

6. An extension for paint guns, comprising a plurality of connected conduits adapted to communicate with the air and fluid conduits of the gun, a fluid tip for one conduit and a nozzle member for another conduit, said tip and nozzle member cooperating to give a spray, said extension being formed of a plurality of sections which are pivotally connected at a plurality of places to provide a means for directing a paint spray to normally inaccessible places. Y

7. An extension for paint guns or the like comprising a plurality of parallel sections, means for pivotally connecting said sections, each section being provided with a fluid conduit and an air conduit communicating to form continuous conduits, a fluid tip at the discharge end of said iiuid conduit, and a nozzle member at the discharge end of said air conduit and surrounding said fluid tip so that the uid tip and nozzle member cooperate to deliver a spray.

8. An extension for paint guns or the like, comprising a plurality of sections, each section being provided with a nuid conduit and an air conduit, means for pivotally connecting said sections, said means including inter-fitting aperture heads on the ends of the sections, said apertures forming part of said air conduit, a iiuid tip at the discharge end of said fluid conduit and a nozzle member at the discharge end of said air conduit.

9. In combination with a paint gun and the like having liquid and air conduits therethrough and trigger actuated valves for controlling said conduits, said gun having a discharge end where the liquid and air conduits meet to cause the atomization of the liquid, an extension for said discharge end, means for detachably mounting the extension attachment on the gun, said extension attachment being provided With liquid and air conduits communicating respectively with the liquid and air conduits in the gun, said extension attachment having an atomizing nozzle oonstruction on its discharge end, the passage of the liquid and air through the conduits being controlled by the trigger oi the gun, part of the extension attachment being angularly adjustable with respect to the other part thereof so as to discharge the atomized liquid at an angle to the normal direction of discharge.

10. In combination with a paint gun and 'the like having liquid and air conduits, valves for controlling said conduits and a trigger for actuating said valves, an elongated extension attachment having a liquid conduit and an air conduit extending therethrough, means for connecting said attachment to the discharge end of the gun with the respective air and liquid conduits in communication with each other, an atomizing nozzle construction at the discharge end of the extension attachment adjustably mounted with respect to the attachment as a Whole whereby the atomized liquid may be sprayed in various directions.

11. In combination with a paint gun and the like having liquid and air conduits therethrough and trigger actuated valves for controlling said conduits, said gun having a discharge end Where the liquid and air conduits meet to cause the atomization of the liquid, an extension for said discharge end, means for detachably mounting the eXtension attachment on the gun, said extension attachment being provided with liquid and air conduits communicating respectively with the liquid and air conduits in the gun, said extension attachment having an atomizing nozzle construcj tion on its discharge end, the passage of the liquid and air thro-ugh the conduits being controlled by the trigger of the gun, the extension being provided with adjustable means so that the position of the nozzle construction may be changed With respect to said extension and the spray may be directed to normally inaccessible places.

12. An attachment for paint guns or the like provided with a section having a plurality of concentric tubular members, another section having a plurality of concentric tubular members, said sections being disalined, means for pivotally connecting said sections together so that the concentric tubular members form a plurality of separate conduits, said pivoting means connecting the respective conduits so as to keep the conduits separated, and a nozzle construction on the end of said second section.

13. An extension for paint guns or the like, comprising a plurality of connected conduits adapted to communicate with the air and fluid conduits of the gun, said conduits being disalined, a fluid tip for one conduit and a nozzle member for another conduit, said tip and nozzle member (3o-operating to give a spray, said extension being formed of a plurality of sections which are pivotally connected at a plurality of places to provide means for directing a paint spray to no1'- mally inaccessible places, the pivotal connection providing means to connect the respective conduits so as to keep the conduits separated.

14. An extension for paint guns or the like, comprising a plurality of sections, each section being provided with a fluid conduit and an air conduit, means for pivotally connecting said sections, said means including complementary apertured hollow heads on the ends of said sections, said apertures forming a part of said air conduit and said hollow portions cooperating to form a part of said iiuid conduit, a fluid tube at the discharge end of said fluid conduit and a nozzle member at the discharge end of said air conduit.

15. An extension for paint guns or the like, comprising a plurality of connected conduits adapted to communicate with the air and fluid conduits of the gun, the gun being provided with a iiuid tip adapted to co-operate with said fluid conduit, a uid tip for one conduit and a nozzle member for another conduit, said tip and nozzle member cooperating to give a spray, said extension being formed of a plurality of sections which are pivotally connected at a plurality of places to provide a means for directing a paint spray to normally inaccessible places.

AUSTIN H. DOWNS. 

